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Propionibacterium acnes (P. acnes) is a rod-shaped, anaerobic, Gram-positive, opportunistic bacterium, that causes infectious and inflammatory diseases, such as acne vulgaris synovitis-acnes-pustulosis-hyperostosis-osteitis syndrome, sarcoidosis, and prostate cancer. Earlier evidence suggests that essential oils have been used to treat skin diseases and disorders since ancient times. Thus, the present study investigated the anti-microbial activity of 28 essential oils from nine families, including Lamiaceae, Poaceae, Geraniaceae, Myrtaceae, Zingiberaceae, Verbenaceae, Cupressaceae, Asteraceae, and Cyperaceae against P. acnes. The anti-bacterial susceptibility and efficacy of the essential oils were examined using paper disc diffusion, broth micro-dilution, time-kill kinetics and ROS assays. P. acnes was cultured under anaerobic conditions. The kinetic process evaluated the time and dose-dependent effects of essential oils. The alteration in membrane potential and ROS production were measured in terms of mean fluorescence intensity. Consequently, the chemical composition of essential oil was analyzed by GC and GC/MS analysis. Eighteen essential oils inhibited the growth of P. acnes with a clear zone of 5 – 20.33 mm. Eucalyptus , Mentha, Palmarosa, Lemongrass, Citronella , Geranium, Patchouli, Ocimum , and Clarysage possess better antibacterial activity (ZGI: 10.33 ± 2.31 mm - 20.33 ± 4.72 mm). Lippia alba oil showed the minimum inhibitory concentration (MIC) of 0.125% v/v, and the MIC of Mentha, Ocimum , and Patchouli oils ranged from 0.25% to 0.50% v/v. Further, the concentration and time-kill kinetic study indicated that L. alba and O. sanctum oils suppress the growth at MIC till 12 h and at 2 × MIC until 72 h. Moreover, the oils induced ROS production with one fold change at 2 × MIC. In addition, O. sanctum oil altered the membrane integrity with a fold change of 1.0 and 2.0 at MIC and 2 × MIC, respectively, while L. alba oil modified a fold change of 1.0. The essential oils suppressed bacterial growth by inducing ROS and modulating membrane integrity. Therefore, L. alba and O. sanctum essential oils could be used as an alternative to chemicals/drugs for treating microbe-associated acne problems. [Display omitted] • Antimicrobial efficacy of 28 essential oils from 9 different families was investigated. • Lippia alba and Ocimum sanctum oils suppress the growth of Propionibacterium acnes. • L. alba and O. sanctum oils depict low MIC compared to other essential oils. • L. alba and O. sanctum oils induce ROS production and modulate membrane integrity. [ABSTRACT FROM AUTHOR]

[Display omitted] Cuscuta reflexa is parasitic plant of subtropical and temperate areas, commonly named as amarbel or akasvel in India. Present study is to investigate the In-vivo anti-inflammatory potential of C. reflexa seed essential oil. In this study the essential oil was hydro-distilled from dried seeds and analyzed for chemical profiling and anti-inflammatory activity. In –vivo activity was performed on mice inducing TPA as disease causing agent. Study of biochemical parameter and oxidative stress was performed by taking homogenate of ear pinna of mice. Chemical analysis is done by GC and GC-MS study, we found β-Bisabolene and Hexahydro farnesyl acetone as the major component as 13.2 and 14.2% respectively along with cis -chrysanthenyl acetate, caryophyllene oxide, carotol, caryophyllene oxide. In-vitro activity of cell viability was assessed using RAW 264.7 macrophages, showed no reduction in viable cell in the processed culture. In-vivo it significantly reduces the inflammation by inhibiting pro-inflammatory cytokines (IL-1β, IL-6 and TNF-α). Cuscuta reflexa seed essential oil was found effective in the management of inflammation by encountering the inflammatory mediators (cytokines). [ABSTRACT FROM AUTHOR]

Background: Staphylococcus aureus (SA), is a major human pathogen causing wide range of clinical infections, which has been further complicated by drug resistance like methicillin resistant S. aureus (MRSA), vancomycin intermediate S. aureus (VISA)/vancomycin resistant S. aureus (VRSA), etc. The present study was aimed at determining anti-staphylococcal potential of citral against drug resistant clinical isolates alone and in combination with antibiotics.Purpose: To assess the potential of citral in combination with norfloxacin in treating drug resistant infections of SA.Study Design: In the present study, synergistic interaction of citral and norfloxacin against drug resistant SA strains was evaluated. Further the efficacy and possible mechanism of action of the combination was also evaluated using in vitro and in vivo assays.Method: The anti-staphylococcal activity of each of the monoterpene and the antibiotic was determined in terms of MIC and the effective concentration of both compounds in combination was obtained by checkerboard assay. In vivo efficacy and oral acute toxicity was evaluated in Swiss albino mice model. To understand the mechanism of action, time-kill curve, bacteriolysis, leakage, membrane depolarization, salt tolerance and ethidium bromide efflux assays were performed.Results: Citral was found effective against clinical isolates of SA with MIC values ranging from 75 to 150 µg ml-1 exhibiting bacteriostatic activity. Citral interacted synergistically, reducing MIC of norfloxacin up to 32-folds with FICI ≤ 0.50. Citral did not affect cell wall, but could damage cell membrane, inhibit efflux pump and affect the membrane potential. Citral could reduce the staphylococcal load of spleen and liver tissues in a dose-dependent manner which was further reduced when used in combination with norfloxacin. Citral did not exhibit any mortality or morbidity up to 500 mg kg-1 body weight and found to prolong the post-antibiotic effect of norfloxacin.Conclusion: Based on these observations, citral could be a lead candidate phytomolecule for further developing it into an anti-staphylococcal agent. The observations of combination study will help in reducing the burden of antibiotics leading to delayed resistance development. [ABSTRACT FROM AUTHOR]

Aging is an unavoidable phenomenon, often afflicting structure and functionality of body, marked with onset of age associated manifestations. Parkinson's disease (PD), the second most common form of dementia is manifested with Lewy body formation and dopaminergic dysfunction. Present study explores silymarin, a known hepatoprotective regimen for its efficacy in Aging and PD using Caenorhabditis elegans . Silymarin positively modulated longevity, reduced oxidative stress, independent of feeding behaviour. Up-regulation of longevity and stress related genes daf-16, sod-3, gst-4 and skn-1 indicate the possible involvement of these genes for regulating longevity. In-addition silymarin alleviated PD symptoms by reducing α-synuclein levels, lipid accumulation and enhanced dopamine function. Silymarin executes its beneficial effects through mitigation of free radicals, while achieving alleviation in Parkinsonism possibly through pdr-1 mediated recruitment of ubiquitin proteasome system as evident from qPCR studies. Altogether, silymarin emerged as a potent molecule for investigation in Aging and age related disorders. [ABSTRACT FROM AUTHOR]

[Display omitted] Oxidative stress causes multidirectional damage including different types of cancers in our body by affecting the normal physiological functions of the cells and tissues. The objective is to study the cytotoxic and antioxidant potential of natural compounds isolated from fruits of Z. armatum DC. This study was designed to investigate the chemical nature as well as biological effects of natural compounds. The isolated compounds were tested for antioxidant effect in various ways e.g. DPPH free radical inhibition, ferric reducing effect, superoxide dismutase, and catalase evaluation. The cytotoxic effect of isolated compounds was evaluated using HepG2 cancer cells. Chemical investigations on the fruits of Z. armatum DC, led to the isolation of two new compounds characterized as (cis)-2, 8-dimethyl-non-5-en-8-ol-2-olyl benzoate (1), (cis)-2, 10-dimethyl-undec-7-en-10-ol-2-olyl benzoate (2) along with five known compounds such as n -dodecanyl linoleniate (3), n -octacos-10, 20-dienoic acid (4), (cis , cis)-dotriacont-6, 12-dienoic acid (5), lignoceric acid (6), and (cis , cis)-dotriacont-6, 8-dienoic acid (7). Compound 1 shows potent activity against HepG2 cancer cells in comparison 2 and significantly affected the viability of cells till 48 hrs. The highest antioxidant potential among compounds and extracts with respect to DPPH free radical inhibition and the ferric reducing effect was shown by compound 1 followed by 2 and 7 with an EC50 value of 19.44, 20.44 and, 22.46 respectively. The present study indicates that compound (1) showed a significant effect against HepG2 cancer cells as well as antioxidant potential through DPPH and FRAP methods. Compounds 2 and 7 also proved to be useful up to some extent for antioxidant potential. [ABSTRACT FROM AUTHOR]

Abstract: The 1mm long Caenorhabditis elegans is one of the prime research tools to study different human neurodegenerative diseases. We have considered the case in which increase in the surrounding temperature of this multicellular model leads to abnormal bursts of neuronal cells that can be linked to seizure or convulsion. The induction of such seizure/convulsion mechanism was done by gradually increasing the temperature with 1× buffer (100mM NaCl, 50mM MgCl2) in adult C. elegans. In the present experiment it is demonstrated that Baccoside A can significantly reduce the seizure/convulsion in C. elegans at higher temperatures (26–28±1°C). Furthermore, in T-type Ca2+ channel cca-1 mutant worms, no convulsion was recorded. Our experimental results suggest that plant molecules from Bacopa monnieri may be useful in suppressing the seizure/convulsion in worms. [ABSTRACT FROM AUTHOR]